Model and activist Dayle Haddon has died of suspected carbon monoxide poisoning in a Pennsylvania home. She was 76.

Solebury Township police responded to a call shortly after 6:30 a.m. Dec. 27 regarding a 76-year-old man who had passed out in a home in Bucks County, police reported. A 76-year-old woman was found dead on the second floor of the house.

According to the police report, high levels of carbon monoxide were found in the property.

A police report update released Dec. 28 identified the woman as Dayle Haddon and the man as Walter J. Blucas, who is currently hospitalized in critical condition.

The suspected carbon monoxide leak was due to “a defective smoke vent and an exhaust pipe from a gas heater,” the police said.

“The officers and members of the Solebury Township Police Department would like to extend our sincerest condolences to the Haddon and Blucas families,” police said in a statement. “This tragic incident is a stark reminder of the importance of carbon monoxide safety precautions in our homes.”

NBC Philadelphia reported that the home is owned by Dayle Haddon’s daughter, journalist Ryan Haddon, and her son-in-law, actor Marc Blucas. TODAY.com has reached out to representatives for Dayle Haddon and Marc Blucas.

According to her website, Dayle Haddon worked as a model for major cosmetics companies such as Revlon, Max Factor, Estée Lauder and L’Oréal. She has appeared on the cover of Vogue, Cosmopolitan and Elle. Her acting credits include The World’s Greatest Athlete and Cyborg.

She is also the author of Ageless Beauty: A Woman’s Guide to Lifelong Beauty and Well-Being and The 5 Principles of Ageless Living.

Ryan Haddon shared a photo collage of her mother on Instagram on Friday and penned a heartwarming tribute.

“The bright light that is Dayle has grown dimmer in this earthly realm. I have no doubt that I am shining as brightly as ever somewhere where it is needed most,” she wrote. “She was a woman in her power, yet gentle and attentive to everyone. Deeply creative and curious, endowed with inner and outer beauty. Always friendly and attentive.”

The post featured footage of Dayle Haddon traveling the world, modeling for various publications and volunteering. Ryan Haddon also included black and white headshots of her mother.

Ryan Haddon called her mother “the biggest champion of all” and an “inspiration to many.”

She continued, saying that she trusts the timing of life, adding, “There are no accidents and certainly how we enter and exit this world is mystical and unknowable.”

“She was a generous spiritual being who valued the development of her soul, so I know that her journey here in this dimension must be complete,” wrote Ryan Haddon.